Characteristics and mechanism of bank erosion and deposition in the Inner Mongolia reach of the Yellow River in recent years
Geometric surveys were finished on 28 channel cross sections of the Yellow River in the Inner Mongolia in the period of 2011-2014.The rate of bank erosion/deposition in the intervals of two consecutive surveys was calculated using the channel geometric measurement.The distributions of bank erosion/deposition rates were investigated and the average bank erosion/deposition rates were related with the mean water discharge and sediment concentration.Results show that the eroded banks account for 64％ with an average bank erosion rate of 0.147m/d,and bank deposition occurs with a percentage of 31％ and an average rate of 0.335m/d.Both the bank erosion and deposition rates have a noticeable positively skewed frequency distribution,and their logarithmic values have a normal distribution.The statistic results of bank erosion/deposition suggest that the channel narrowing trend after the closure of upstream large dams has nearly disappeared.Both the bank erosion and deposition rates are positively related with the mean water discharge.The relations of bank erosion/deposition rates with the water and sediment factors constructed for the river reaches under discussion reflect the response of bank erosion/deposition to changes in water discharge in flood and low flow seasons.
国家科技期刊平台
NSTL
万方数据
维普
